CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 15,160	$ 23,546
Marketable investments	67,121	62,026
Accounts receivable, net	7,494	8,841
Inventories	10,421	11,114
Deferred tax asset	38	40
Other current assets and prepaid expenses	1,583	1,439
Total current assets	101,817	107,006
Property and equipment, net	1,461	933
Deferred tax asset, net of current portion	503	553
Intangibles, net	2,044	2,566
Goodwill	1,339	1,339
Other long-term assets	348	397
Total assets	107,512	112,794
Current liabilities:
Accounts payable	2,100	2,107
Accrued liabilities	7,784	9,493
Deferred revenue	7,195	6,618
Total current liabilities	17,079	18,218
Deferred revenue, net of current portion	3,395	2,102
Income tax liability	69	412
Other long-term liabilities	1,353	1,288
Total liabilities	21,896	22,020
Commitments and contingencies (Note 10)
Stockholders' equity:
Convertible preferred stock, $0.001 par value; authorized: 5,000,000 shares; none issued and outstanding	0	0
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 14,121,070 and 14,233,476 shares at September 30, 2013 and December 31, 2012, respectively	14	14
Additional paid-in capital	99,899	100,552
Accumulated deficit	(14,342)	(9,873)
Accumulated other comprehensive income	45	81
Total stockholders' equity	85,616	90,774
Total liabilities and stockholders' equity	$ 107,512	$ 112,794